CONTENT
INTRODUCTION
METHOD
PROCEDURE
The INSOLUBLE SALT is one of salt that can not dissolve in water at room temperature
INSOLUBLE SALT
The examples of insoluble salt:
Stalactite
Pearl
Coral
DOUBLE DECOMPOSITION METHOD
METHOD
In double decomposition reaction, ions from the two different aqueous solution are exchangeable to form one of new compound which is not soluble in water.
Solution A:contain the metal ion (cation,M+)
+
Solution B:contain the
non-metal ion(anion,X-)
Insoluble SaltPrecipitate
MX
CONTINUE….
In this method, requires two solution:
DOUBLE DECOMPOSITION METHOD For example, plumbum (II) chloride, PbCl2 is one of the insoluble salt.Pb(NO3)2 + 2 KCl PbCl2 +2 KNO3
Pb2+ 2 Cl-+ PbCl2
CONTINUE….
DOUBLE DECOMPOSITION METHODCHEMICAL EQUATION
Ca(NO3)2
Ca+ 2NO3-
Na2SO4
2Na+ SO42+
+
Ionic Equation:
Ca2+ + SO42+ CaSO4
Ca(NO3)2 Na2S04 CaSO4 2NaNO3+ +
PROCEDURE OF PRECIPITATION REACTION
Mix two solution
Filtration
Wash
Dry
Pure salt crystal
Preparation of PbI2
ACTIVITY 8.7ACTIVITY 8.7
AIM : TO PREPARE AIM : TO PREPARE INSOLUBLE SALT BY USING INSOLUBLE SALT BY USING PRECIPITATION REACTIONPRECIPITATION REACTION
MATERIALS : 1 MOL DMMATERIALS : 1 MOL DM-3-3 LEAD (II) NITRATE LEAD (II) NITRATE SOLUTION, 1 MOL DMSOLUTION, 1 MOL DM-3 -3 POTASSIUM IODIDE POTASSIUM IODIDE
SOLUTION, 1 MOL DMSOLUTION, 1 MOL DM-3-3 BARIUM NITRATE BARIUM NITRATE AND 1 MOL DMAND 1 MOL DM-3-3 POTASSIUM SULPHATE POTASSIUM SULPHATE
APPARATUS : 250 CM3 BEAKER, GLASS ROD, APPARATUS : 250 CM3 BEAKER, GLASS ROD, FILTER FUNNEL AND FILTER PAPERFILTER FUNNEL AND FILTER PAPER
1. Add 50 cm3 of potassium iodide solution to 50 cm3 of lead (II) nitrate solution
2.stir with the glass rode
Yellow precipitate occur
Filter the mixture after the precipitate occur
Wash the precipitate of salt with deionized water
Dry the precipitate
Pure salt crystal formed
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